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UNITED STATES PATENT OFFICE.

JOHN A. CURLEY, OF GLEN'S FALLS, NEW YORK.

PROCESS FOR UNI'IING METALS DIFFERING IN GRADES.

No Drawing.

To all whom it may concern:

Be it known that I, J OHN A. GURLEY, a citizen of the United States, residing at Glens Falls, in the county of Warren and State of New York, have invented certain new and useful Improvements in Processes for Uniting Metals Differing in Grades, of which the following is a specification.

This invention relates to improvements in metal joining processes; the dominant object of the invention being to provide a process whereby the jointure of high speed steel and soft steel can be positively effected and as a consequence, affording a means whereby the so called scraps of high speed steel used as the cutting elements in connection with metal working machines can be completely use As set forth in my co-pending application for Letters Patent filed on or about April 2, 1918, Serial No. 226,281, pertaining to the improved compound for effecting the jointure, considerable waste is involved in the use of high speed steel cutting elements at the present day, due to the fact that when the same become worn to a certain extent they cannot be securely held in the usual forms of holders generally adopted by large metal working plants and therefore, must be discarded. With my improved process I am enabled to completely use these discarded scraps by joining the same to bodies of soft steel which are of sizes and shapes such as to allow their arrangement and clamping in said holders.

The invention consists, furthermore, in the novel steps employed in the process as well as in the details of the same and the manner of application of the metal uniting compound, all of which will be more fully described in the following specification, and then finally embodied in the clauses of the claim which are appended to this specification and which form an essential part of the same.

The improved process in its preferred form may be stated as follows:

A piece of soft steel of suitable size and shape is provided with a seat adjacent one end thereof, whereupon the discarded scrap of high speed steel is fitted onto said seat, whereupon the several pieces of metal so arranged are placed in pro-per position in a suitable furnace and brought to a temperature of approximately 2000 F.; this being the proper temperature for heat treating Specification of Letters Patent.

Patented Oct. 28, 1919.

Application filed April 2, 1918. Serial No. 226,282.

metals of this grade. With the metal pieces so heated, the same are removed from the furnace and the soft steel body or shank is thoroughly cleaned whereupon a compound such as set forth in my co-pending application hereinbefore referred to and containing zinc, copper, boric acid, zinc sulfate, sulfate of copper, canbonate of iron and chlorate of potash is applied to the adjacent surfaces of the high speed steel and the soft steel to be united. The flux, properly prepared, will immediately flow, thus insuring the coating of the entire adjacent surfaces. At this time, the high speed steel is placed in the seat formed on the soft steel shank or body whereupon the tools are clamped together in a suitable manner for approximately 15 seconds, after which they are removed and cooled by a cold air blast.

With the pieces thus united, the same are ready to grind, after which they may be arranged in the machine holder and by properly adjusting the soft steel shank, the high speed steel piece may be entirely used; hence, effecting a material saving upon part of the user. Further, attention is directed to the fact, that a jointure made in accordance with my improved process will not loosen by reason of heat generated due to friction nor by vibration caused by the operating machinery. Further, I have, by means of extensive and stringent tests, obtained results most satisfactory from pieces of steel united. in the manner herein set forth.

It is to be also understood that the improved process may be used for joining new material to bodies of soft steel as well as for joining scraps thereto.

It may be well to here note that I am informed of various attempts made in the art with a view toward uniting high speed and soft steels; such as by brazing and welding processes. Obviously, such processes are impractical. The welding of high speed steel to soft steel has been found unsatisfactory, especially with the use of an oXy-acetylene blowpipe or with electric methods; since the oxy-acetylene blowpipe produce-s a temperature of approximately 6300 F., while the prevalent electric welds reach a still higher temperature, which as will be appreciated by workers in the art, will cause degeneration of the high speed steel in that the heat resisting qualities thereof will be completely broken down due to the intensity of the heat applied thereto. Therefore, high speed steel heat treated in this manner cannot 'be used with certainty as the cutting elements for use in metal Working machinery. XVith my improved process it is not necessary to heat the metal to a temperature exceeding approximately 52000 F. and as a consequence, the qualities peculiar to the high speed steel so treated are not in any Way detrimentally affected.

I claim:

1. The herein described process for uniting high speed and soft steels consisting of placing the metals adjacent each other and heating the same to a predetermined degree not exceeding approximately 2000 degrees F, in a suitable form of furnace, ther after removing the steels from the furnace, then applying a uniting compound to the adjacent surfaces thereof, whereupon the same are clamped temporarily together and finally subjected to a cooling air blast.

2. The herein described process for joining high speed and soft steels consisting of forming a seat in one portion of the soft steel and placing the high speed steel therein, then subjecting each of the same to heat in a suita'ble form of furnace for bringing them to a predetermined temperature not exceeding approximately 2000 degrees F., thereafter then applying a uniting compound to the adjacent surfaces, whereupon the same are clamped temporarily. together and finally subjected to a coolingvair blast.

3. The herein described process for joining high speed and soft steels consisting of notching or forming a seat in a portion of the soft steel and arranging the high speed steel therein, then placing the steels in a suitable form of furnace and heating the same to a temperature not exceeding the usual heat treating temperature of high speed steel, thereafter removing the steels from the furnace, then applying a uniting compound to the adjacent surfaces of said steels subsequently to the cleaning of the same, whereupon they are clamped temporarily together and finally removed and subjected to a cooling air blast.

In testimony whereof, I affix my signature hereto.

JOHN A. CURLEY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

removing the steels from the furnace, 

